On Thu, Feb 18, 2010 at 5:36 PM, Jeff <[email protected]> wrote: > On Feb 18, 4:31 am, Conrad Taylor <[email protected]> wrote: > > On Wed, Feb 17, 2010 at 9:23 PM, Jeff <[email protected]> wrote: > > > Anybody know if the changes coming to Rails 3 that affect ActiveRecord > > > can be applied to Rails 2.x projects as well? If it's just the > > > ActiveRecord gem that's changing, then we should be able to use the > > > new ActiveRecord gem with Rails 2 apps, right? > > > > No, this isn't possible. Why? ActiveRecord in Rails 3 is dependent on > > other Rails 3.0 gems. For example, AR in Rails 3 depends on the > > following gems: > > > > http://gemcutter.org/gems/activerecord/versions/3.0.0.beta > > > > As an exercise for yourself, you can use the above to navigate the entire > > dependency graph and it should be clear why your approach wouldn't be a > > good idea. Furthermore, you can compare the dependency graph for both > > Rails 2.3.5 and Rails 3.0.0 beta: > > > > http://gemcutter.org/gems/rails/versions/2.3.5 > > http://gemcutter.org/gems/rails/versions/3.0.0.beta > > Interesting, thanks for the links. ActiveRecord 3.0 depends on Arel, > ActiveModel, and ActiveSupport. The only common dependency I see is > ActiveSupport. If I could get a Rails 2.3.5 app to bind to > ActiveSupport ">= 2.3.5", instead of exactly equal to 2.3.5, then > perhaps it might work. Except, that I don't know if there are > breaking changes in ActiveSupport 3.0 that break Rails 2.3.5 apps > (there probably are). > > You need to look at all the dependencies for Rails 2.3.5 requires these exact dependencies:
Runtime Dependencies 1. *activeresource* = 2.3.5 <http://gemcutter.org/gems/activeresource> 2. *actionmailer* = 2.3.5 <http://gemcutter.org/gems/actionmailer> 3. *actionpack* = 2.3.5 <http://gemcutter.org/gems/actionpack> 4. *activerecord* = 2.3.5 <http://gemcutter.org/gems/activerecord> 5. *activesupport* = 2.3.5 <http://gemcutter.org/gems/activesupport> 6. *rake* >= 0.8.3 <http://gemcutter.org/gems/rake> Rails 2.3.5 requires ActiveSupport 2.3.5 (i.e. you cannot use an earlier version or a later version) of this gem. Next, the rake and bundler gems are compatible with both versions of Rails. > I guess I just wish the new ActiveRecord/ActiveSupport functionality > could have been added to Rails 2.x, and we could have a new version > like Rails 2.4, rather than only being available with Rails 3.0. > > Please understand that the Rails core team have re-architected many of the common components. Thus, you'll need to upgrade to benefit from these changes and I would highly recommend reading the following as well as the associated links: http://guides.rails.info/3_0_release_notes.html http://guides.rails.info Good luck, -Conrad > Thanks again, > Jeff > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<rubyonrails-talk%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
